Instances›AWS EC2›u-12tb1›u-12tb1.metal
Compute
vCPUs448
Memory12288 GiB
Mem / vCPU27.43 GiB
ProcessorXeon Scalable
Clock speedN/A
Architecturex86_64
Storage
TypeEBS only
BandwidthN/A
ThroughputN/A
IOPS0
Networking
Performance100 Gigabit
Max ENIsN/A
IPv6Yes
GPUNone
Family sizes
u-12tb1.112xlarge448 vCPU · 12288 GiB
u-12tb1.metal448 vCPU · 12288 GiB
u-12tb1.metal

The u-12tb1.metal pairs 448 vCPU with 12288 GiB of RAM, the 27.43 GiB-per-vCPU ratio that marks a memory-optimized instance. It runs on Intel Xeon Scalable (Skylake), and AWS introduced it in September 2018. Spot's largest VM is 16 vCPU and 128 GiB, so matching this instance would take 88 × mh.vs1.2xlarge — arithmetically true and operationally absurd. The Spot column below prices that whole fleet, so read it as a scale reference rather than a drop-in replacement: at this size the useful question is what a shard of the workload costs.

Match qualityNo single-node equivalent

u-12tb1.metal is 448 vCPU and 12,288 GiB. The largest comparable Spot node is mh.vs1.2xlarge at 16 vCPU and 128 GiB, so matching it would take 88 of them. That maths works out, but 88 nodes is a redesign rather than a migration — a single block of 12,288 GiB does not survive being split across a network.

If you chose u-12tb1.metal because the work genuinely needs 448 cores and 12,288 GiB together — an in-memory database, a large analytics engine, a single big solver — Rackspace Spot has no equivalent. What does fit is everything around it: the application servers, batch workers and CI that talk to that machine, which is usually the larger share of the bill.

Pricing by region
1 hr
RegionAWS on-demandAWS Spot1-yr Reserved3-yr ReservedRackspace SpotYou save
US East, N. Virginia$1.848
US Central, Chicagono AWS region$1.848
US Central, Dallasno AWS region$11.528
Hong Kong$1.848
Sydney, Australia$1.848
London, UK$11.528
US West, San Jose$0.175
US Central, Dallas 2no AWS region$21.175
When to use it
Good for
  • ●Database instances that keep the working set in RAM
  • ●Graph and search workloads with large indexes
  • ●In-memory caches such as Redis and Memcached
  • ●Workloads that fit inside 12288 GiB of RAM
  • ●Parallel work that can occupy 448 vCPU
  • ●Network-heavy services — AWS rates this size at 100 Gigabit
Avoid if
  • ●The working set needs more than 12288 GiB of RAM
  • ●You want a single-machine Spot equivalent. At this size there is not one.
  • ●Local NVMe or instance-store disk is a hard requirement
  • ●GPU or FPGA acceleration is needed
  • ●CPU-bound work. You are paying for memory this workload will not use.
  • ●More than 27.43 GiB of RAM per vCPU is needed — that ratio is fixed for the whole family
Rackspace Spot sells spare capacity at market prices. You pay what the market decides, not a list price.
  • Spot sells spare capacity at market prices. It is the cheapest compute on the internet.
  • Prices are set by supply and demand. You pay what the market decides.
  • Compute is delivered as fully managed Kubernetes. All infrastructure is taken care of.
  • Egress costs $0.01/GB after the free allowance. AWS charges $0.09/GB.
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